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MRI Anniversary Lecture on treeline patterns

"The stories that alpine treelines can tell - interpreting spatial patterns of treeline ecotones"

Presented by Maaike Bader, April 28, 2021, 15:00 — 16:00 CEST

A recording of the lecture is now available at the Mountain Research Initiative (MRI) website.

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Anouncement: special issue in the journal "Forests"

"The impact of Climate Change on Alpine Treelines and Vegetation Dynamics"

Edited by Pavel Moiseev, submissions possible until November 2021.

See the MDPI website for more information.

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New treeline pattern paper out!

"A global framework for linking alpine-treeline ecotone patterns to underlying processes", Ecography

Posted by: Maaike Bader, November 10, 2020

Six examples of distinct treeline forms

Examples of treeline forms as described in the new Ecography paper. From left to right and top to bottom: gradual treeline, diffuse treeline, abrupt tree-island treeline, abrupt treeline, abrupt diffuse treeline in shrub matrix, krummholz-island treeline. From Bader et al, early view.

We are very happy to announce the publication of our new paper (open access in Ecography, for download here) addressing the pattern dimensions that we think are most indicative of the processes forming spatial patterns in alpine-treeline ecotones, and redefining some terminology for describing treeline spatial pattern or "form". This paper is the culmination of our discussions during several workshops in the past years, starting with the MRI synthesis workshop in Jaca, Spain, in 2017, followed by the two sTreelines workshops at sDiv (iDiv, Leipzig, Germany) in 2018 and 2019 and a workshop organised by Bradley Case in Hanmer Springs, New Zealand, in 2020.

Apart from defining four main pattern dimensions (two in the x-y plane: 1) changes in tree cover, and 2) changes in the level of clumping; two in cross-section: 3) changes in tree height, and 4) changes in tree shape), we here also suggest a more precise terminology for describing treeline forms. In particular, we suggest to use two different terms for describing the smoothness of the transition: if there is a sudden strong frop in tree HEIGHT the treeline is "abrupt", but if only the decrease in tree COVER is sudden and strong, this treeline is "discrete". If both change suddenly and strongly, the treeline is still "abrupt", because we consider discreteness as the default. At the other end, if tree HEIGHT decreases gradually, the treeline is "gradual", but if tree COVER decreases gradually, the treeline is "diffuse". If both decrease gradually, the treeline is still "diffuse", because we consider a gradual height decline as the default. Now one can guess what an abrupt diffuse treeline looks like... Additionally, there are tree-island and krummholz-island treelines and some other forms... I recommend reading the paper for more details and further insights :-)

You may also check out our blogpost on the Ecography website.

Abrupt discrete southern-beech treeline in New Zealand

An abrupt (and discrete, which is the default so it does not need to be mentioned) treeline formed by Lophozonia menziesii (Nothofagaceae) near Lewis´ Pass on the South Island of New Zealand.

Reference: Bader, M.Y., L.D. Llambí, B.S. Case, H.L. Buckley, J.M. Toivonen, J.J. Camarero, D.M. Cairns, C.D. Brown, T. Wiegand and L.M. Resler (2021) A global framework for linking alpine-treeline ecotone patterns to underlying processes. Ecography 44(2): 265-292, DOI 10.1111/ecog.05285.

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